Electromagnetic locking device



(No Modl.) 2 Sheets-Sheet 1. E. J.,M. SOHEBREN.

BLEGTROMAGNETIG LOCKING DEVICE.

I @Mou/W vMT1-3D STATES PATENT Trice.

ELECTROIVAGNETIC LOCKING DEVICE.

SPECIFICATION forming part of Letters Patent No. 580,820, dated April13, 1897. Application led October 13, 1896. Serial No. 608,758. (Nomodel.)

To all whom it may concern.'

Be it known that I, Eernus JULIUs M. SCHEEREN, a citizen of the UnitedStates of America, residing at Denver, in the county of Arapahoe andState of Colorado, have invented certain new and useful Improvements inElectromagnetic Locking Devices; and I do declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to thefigures of reference marked thereon, which form a part of thisspecification.

My invention relates to improvements in electromagnetic appliances forlocking doors, whereby the movement of the spring-held bolt by the knobor other actuating device is prevented by pressing a push-button.

The invention consists of the features hereinafter described andclaimed, all of which will be fully understood by reference to theaccompanying drawings, in which is illustrated an embodiment thereof.

In the drawings, Figure 1 shows my improvements connected with orapplied to a lock for an outside door, one plate of the lockcasing beingremoved. Fig. 2 is a perspective view in detail of the device showndetached from the lock. Figs. 3 and 4 illustrate another form ofconstruction applied to a lock for an inside door and operated on thesame principle. Fig. is a section taken through the lock-casing,illustrating the construction of the thumb-levers.

Referring first to Figs. 1, 2, and 5, let the numeral 5 designate thespring-held bolt, normally adapted to be withdrawn by pressing either oftwo thumb-levers 4, (see Fig. 5,) which engage and actuate a bell-cranklever 6, fulcrumed at 7. The levers 4are fulcru med in the door j ustbelow the lock-@asin g, which is provided with an opening to allow thethumblevers to act on the lever The levers 4 are provided withguard-flanges 4n to prevent the insertion of anything from the outsidethat might interfere with the working of the levers. The arm 6n of thelever 6 engages a stop 5a, attached to the inner extremity of a bolt 5.If the bell-crank lever is actuated or turned on its fulcrum, the arm 6athereof will press against the stop 5n and withdraw the bolt from thelocking position. To enable me to prevent this withdrawal of the bolt, Iemploy an arm 8, pivoted on a post 9, attached to the lock-casing. Tothe extremities of the arm 8 are movably attached two yokeslO and 10",respectively. The outer extremities of these yokes project beyond thelock-casing and carry pole-pieces 12, composed of soft iron or othermagnetic material, located in suitable proximity to two electromagnets13 and 13a. These magnets are electrically connected with or placed inthe circuits 15 and 16, respectively, of a battery 14 or othersuitablesource of electricity. These circuits are normally open, but may beclosed by pressing the push-buttons 17 and 18, respectively. If thepush-button 17 is pressed, the magnet 13 is energized and acts on theyoke 10 through the soft-iron pole-piece 12 and shifts the arm 8 to theposition shown in the drawings. (See Fig. 1.) When the arm 8 is'in thisposition, one of its extremities lies in the path of the arm 6c of thebell-crank lever 6 and prevents the movement of said lever. Hence thebolt 5 cannot be withdrawn when the arm 8 is in this position.

Vhen it is desired to open the door, the button 1S is pressed,momentarily closing the circuit 16 and energizing the magnet 13, which,acting on the pole-piece 12 and the yoke 10, reverses the position ofthe arm S or shifts it to the position shown by dotted lines in Fig. 1.Vhen in this last-named position, the arm 8 presents no obstacle to thewithdrawal of the bolt 5, which may be operated at will.

The yokes 10 and 10 are provided with shallow recesses B, adapted toengage stoppins D when the yokes have reached their limit of movement ineither direction. These pins temporarily lock the yokes in eitherposition of adjustment, but do not interfere with their movement whenacted on by the magnets. This construction allows the owner or person incharge of a store to lock the door or doors leading from theestablishment into the street by simply pressing a button. A thief orother evilly disposed person may thus be locked in and prevented fromescaping.

In the construction shown in Figs. 3 and 4 the device is employed. Thisdevice is IOO composed of the parts 25, 25C, 25d, and 25g. The part 25ais located within the lock-casing, while the part 25d is exteriorlylocated and provided with the pole-pieces 25g, composed of magneticmaterial, as soft iron. The parts 25u and 25d are rigidly connected bythe part 25C, which is pivoted to the casing at a point 25h. One arm ofthe part 25a is adapted to lie in the path of the device 26, which mustbe actuated in order to withdraw the bolt 29. The device 26 is connectedwith the bolt 29 by an arm 30. This is an ordinary lock mechanism andtherefore need not be illustrated or explained in detail.

The two magnets 27 and 28 are energized by closing the push-buttoncircuit and are adapted to act upon the device 25. If the magnet 28 isenergized, the part 25a is proj ected into the path of the device 26,whereby the latter cannot be actuated by turning the knob of the door orin the ordinary manner. On the other hand, if the magnet 27 is energizedthe device 25 is actuated in such a manner as to withdraw the part'25from the path of the device 26, leaving the bolt 29 free to be withdrawnin the usual manner.

Having thus described my invention, what I claim is- 1. The combinationwith the lock-casing, of an arm pivoted on the casing and inclosedthereby, said arm. being adapted to move into the path of the boltwithdrawing device, yokesrespectively attached to the arm extremitiesand carrying pole-pieces projecting beyond the lock-casing, two distinctelectromagnets located in suitable proximity to these pole -piecesrespectively, circuits normally open, in which the magnets respectivelylie, and suitable means, as push-buttons, for alternately andmomentarily closing the circuits, substantially as described.

2. The combination with a locking mechanism, of a suitable devicemovably attached to the casing and adapted to be projected into the pathof the bolt-withdrawing instrumentality, two electromagnets adapted,when energized, to act respectively on two oppositelylocated parts ofthe said device, and two push-button circuits in which the magnetsrespectively lie, whereby when one magnet is energized, the device isshifted inv one direction, and when the other magnet is energized areverse movement is imparted to the said

